Kromschroder Air pressure switch DL3AG-3 84444450

The Kromschroder DL3AG-3 is a diaphragm pressure switch designed for monitoring air or flue gas pressure in systems such as boilers and ventilation. It has an adjusting range of 0.2 to 3 mbar and features a tempered LSR diaphragm system. The housing is made of glass fibre reinforced PBT plastic, and the electrical connection is via screw terminals. The switch operates with a microswitch conforming to EN 61058-1 and has protection class II. It weighs 300 g and has a connection thread of Rp 1/4.

When selecting a replacement pressure switch of this type, ensure the pressure range, connection thread, and electrical ratings match the original. The switch must be compatible with the medium (air or flue gas) and the system's maximum temperature. Installation should follow the manufacturer's guidelines, including proper torque for the cover screw and strain relief.

Common failures include diaphragm rupture or leakage, leading to inaccurate pressure readings or failure to switch. Microswitch contacts may wear or stick, causing intermittent operation or no switching. Check for physical damage, contamination, or corrosion on the sensing element and verify the switch operation with a manometer.